[libcamera-devel] [PATCH v2] file_sink.cpp: Avoid dangling-reference

[Khem Raj]

Fixes following errors with gcc-13

../git/src/cam/file_sink.cpp:92:45: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
   92 |                 const FrameMetadata::Plane &meta = buffer->metadata().planes()[i];
      |                                             ^~~~
../git/src/cam/file_sink.cpp:92:81: note: the temporary was destroyed at the end of the full expression '(& buffer->libcamera::FrameBuffer::metadata())->libcamera::FrameMetadata::planes().libcamera::Span<const libcamera::FrameMetadata::Plane>::operator[](i)'
   92 |                 const FrameMetadata::Plane &meta = buffer->metadata().planes()[i];
      |                                                                                 ^
cc1plus: all warnings being treated as errors

Upstream-Status: Submitted [https://lists.libcamera.org/pipermail/libcamera-devel/2023-January/036575.html]
Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
v2: Rebase on tip of trunk

 src/apps/cam/file_sink.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/apps/cam/file_sink.cpp b/src/apps/cam/file_sink.cpp
index b32aad24..9f4c5648 100644
--- a/src/apps/cam/file_sink.cpp
+++ b/src/apps/cam/file_sink.cpp
@@ -114,13 +114,13 @@ void FileSink::writeBuffer(const Stream *stream, FrameBuffer *buffer,
 	}
 
 	for (unsigned int i = 0; i < buffer->planes().size(); ++i) {
-		const FrameMetadata::Plane &meta = buffer->metadata().planes()[i];
+		unsigned int bytesused = buffer->metadata().planes()[i].bytesused;
 
 		Span<uint8_t> data = image->data(i);
-		unsigned int length = std::min<unsigned int>(meta.bytesused, data.size());
+		unsigned int length = std::min<unsigned int>(bytesused, data.size());
 
-		if (meta.bytesused > data.size())
-			std::cerr << "payload size " << meta.bytesused
+		if (bytesused > data.size())
+			std::cerr << "payload size " << bytesused
 				  << " larger than plane size " << data.size()
 				  << std::endl;
 
-- 
2.39.1